U. S. B. F.— Doc. : 



Plate I. 



FIG. 1.— TRUNCILLA WALKERI, NEW SPECIES. 

 Upper figures, females; lower figures, males. 



FIG. 2.— THE GREAT FALLS OF THE CUMBERLAND, 85 FEET HIGH, 

 FISH AND MUSSELb. 



5ARRIER TO THE ASCENT OF 



